Configuration Guide     689
Configuring DHCP Filter DHCPv4 Filter Configuration
Step 4 end
Return to privileged EXEC mode.
Step 5 copy running-config startup-config
Save the settings in the configuration file.
The following example shows how to create an entry for the legal DHCPv4 server whose IP 
address is 192.168.0.100 and connected port number is 1/0/1 without client MAC address 
restricted:
Switch#configure
Switch(config)#ip dhcp filter server permit-entry server-ip 192.168.0.100 client-mac all 
interface gigabitEthernet 1/0/1
Switch(config)#show ip dhcp filter server permit-entry
Server IP               Client MAC            Interface
----------------     -----------------     ---------
192.168.0.100      all                             Gi1/0/1
Switch(config)#end
Switch#copy running-config startup-config